Delivery option not provided (error) in afterpay

Hi team,
I’m having trouble getting the Express Checkout to work and some users are experiencing an error notice on the afterpay portal website saying “Delivery option not provided”, please refer this screenshot url: https://tinyurl.com/ytp7rehq .
I use the Advanced Flat Rate Shipping For WooCommerce plugin. I have 2 shipping zones for Australia, NZ.
After troubleshooting this for a while I can see that on the Cart page, only the country and region are selected, i have tried with adding full address with postal code. but same issue facing.

Anyone else experiencing this? Looking forward to your reply.